Two bikes ‘P’ and ‘Q’ are standing 50 kms apart. Bike ‘P’ starts moving towards ‘Q’. After half an hour, bike ‘Q’ starts to move in the same direction. After an hour of start of bike ‘Q’, they reach at the same destination. What is the speed of the Bike ‘P’?

1.

60 kmph

2.

40 kmph

3.

50 kmph

4.

Cannot be determined

5.

None of these

Solution

Answer:

P & Q are standing 50 kms apart.

Suppose, speeds of P & Q are x & y km/hour respectively

Bike ‘P’ starts moving towards ‘Q’. After half an hour, Bike ‘Q’ starts to move in the same direction.

A 180-meter long train crossed another 270-meter long train running in the opposite direction in 10.8 seconds. If the speed of the first train is 60 kmph, what is the speed of the second train in kmph?